US3490870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the production of carbon black
Assignee: Columbian Carbon Co
•
Filing: 1967-08-09
•
Granted: 1970-01-20
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Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 Charles L De Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:43
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2779665A
Cited
US3003854A
Cited
US3003855A
Cited
US3235334A
Cited
US3301639A
Cited
US3340010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |